Two-stroke combustion-engine.



Patented Sept. 4, 1917.

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TWO-STROKE COMBUSTION ENGBNE.

APPLKCAHN FILED DEC. l0. 1914i S www f/ y@ i, v

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RUDQWIST, 0F MUNICH, GERMANY.

TWO-STROKE COMBUSTION-ENGINE.

Specification. of Letters Patent.

Patented Sept. 4, 1917.

t Application led December 10, 1814. Serial No. 876.411.

To all whom it may concern.'

Be it known that I, CARL RUDQWIST, a citizen of the Swedish Kingdom,residing at Munich, Bavaria, Germany, have invented certain new anduseful Improvements in Two-Stroke Combustion-Engines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and` use the same. v

This invention relates to a two stroke cycle combustion engine embodyingimprovements for enabling the engine to be employed as a high speedengine.

In connection with a two stroke cycle combustion engine having a steppiston, it is necessary,-while the air is being compressed in thecombustion cylinder, to store the scavenging and charging air until thepiston has uncovered the channels, Which establish communication betweenthe air chamber and the combustion cylinder. The connecting channelbetween the air pump and the air chamber is frequently shut off byvalves, which open when the pressure in the air puni is higher than inthe chamber and close when the pressure is lower. Experience has,however, Shown that these valves have many disadvantages.

The object of the present invention is to obviate the above-mentioneddrawbacks.

A combustion engine constructed according to the present invention isshown in the accompanying drawing.

Figure 1 is a longitudinal section.

Figs. 2 and 3 show the distributing member A in different positions.

'Ther distributing member consists, as shown in Fig. 1, of a cylindricalslide valve. A", which derives its reciprocatory move,- lnent from aneccentric B and is, provided with admission ports P P1 and withcontrolling ports S, C, H; a valve D is provided between the controllingports C and H and the chamber E .is closed above by a valve R.

The eccentric B is disposed relatively to the crank in such a mannerthat during the compression stroke the distributing member A establishescommunication between the step piston pump and the chamber ll (seeposition Fig. 2), the crank being horizontal and the piston having itshighest speed. In the end position of t piston (middle position as shownin Fig. l), the

distributing member A has shut ofi' the suction ports Il and Prand it isonly when the air pump-begins to compress the drawn in air, that thepassa e leading to the air chamber is opened t rough the medium of thecontrolling port S.

It is obvious from The position as shown in Fig. 3' that the port S ofthe air` chamber F is closed during the complete suction stroke of theair pump. It is also obvious from Fig. l that the connecting channel andthe valve top' can be formed as air chambers I"1 and E.

It is finally also obvious from the drawings how the air supplied by theair pump is separated into two parts by the distributing member and thevalve 'D respectively 'l'. e.

`one part for scavenging andanother part for charging the Aworkingcylinder. This is ell'ectcd by closing the channel (l (Fig. -2) duringthe complete compression stroke. The air for charging passes through thevalve D into the chamber E, while the air for scavenging the workingcylinder remains in the chamber F. As the scavenging air must not enterthe combustion cylinder uuder the same high pressure as thc chargingair, the latter is led through the port C, after the compressionstroke?, out of ldie air chamber' F to the chamber F Where it is storedand reduced to the desired pressure. When the piston has uncovered theport G in the combustion cylinder, thc working cyl-v inder is scavengedby the air contained in the chamber F and chamber F1, respectively. Whenthe piston shuts oil' the exhaust port (L, the port Il in thedistributing member is opened and the air stored in the air chamber Epasses through the channel Ill into the cylinder.V M is a noir/.lethrough which fuel is sprayed into the engine cylinder, and W, W are thebearings for the en- Although I may use any suitable ignition device, toignite the mixture of fuel and air within the combustion space of theengine cylinder, I have shown a special form of ignition device whichconsists of a hollow metallic body at the head of the cylindersurrounded by an electric heating coil Z. The latter is provided withterminals N, N', for connection to a suitable source of electriccurrent. The ignition device is preferably so positioned as to besurrounded by the water-jacket of the engine cylinder.

In order to maintain a good piston pin' f said valve casing into a -inglubrication in a simple, economical and yet perfect manner, which washitherto always a difficult task in connection with a vertical motor,the step piston is formed as a trough and the piston pin K (Fig. l) isprovided in the piston with a bore and is fitted in such a manner thatthe oil dropping from the upper cylinder flows in the direction of thearrow to the piston pin bearing through the bore in the piston pin.

1. In a two stroke cycle combustion engine, the combination of an enginecylinder having a combustion chamber and a pumping chamber therein, avalve casing supported adjacent said engine cylinder and having portopenings communicating, respectively, with said combustion chamber andsaid .pumping chamber, a valve slidable in said valve casing, said valvehaving ports therein adapted to register with the port openings in thecasin means dividing said valve casing into a jacent chambers andpermitting passage of air from one chamer to the other in but onedirection, and

means for reciprocating said valve to successively' cause the portstherein to register with the port openings in the valve casing, wherebya charge of scavenging air first passes from one of the chambers'in thevalve into the combustion chamber and thereafter a second charge of airfor admixture with fuel passes from the other chamber in the vai-ve intosaid combustion chamber.

2. In a two stroke cycle combustion enine, the combustion of an enginecylinder lgiaving a combustion chamber and a pump- 4ing chamber formedtherein, a valve casing supported adjacent said engine cylinder andhaving air admission port openings in communication with said pumpingchamber, said valve casing also having a port openin communication withsaid combustion chamber and an intermediate scaven ng air port openingtherein, a valve sli able in said valve casing and having plorts adaptedto register, respectively, with te port o enings in said valve casingmeans divi ing djacent chambers and permitting passa of air from onechamber to the otherA in but one direction, and means for reciprocatingsai'd valve ,to successively cause the ports therein to regia ter withthe port openings in the valve casing, whereby a charge of scavengingair first passes from one of the chambers in the valve into thecombustion chamber and thereafter' a sei-,ond charge of air foradmixture with fuel passes from the other chamber 1n the valve into saidcombustion chamber.

3. Ina two stroke cycle combustion enchambers, said valve having gine,the combination of an engine cylinder havin a combustion chamber and apumping c amber therein, a valve casing supported adjacent said engine clindor," said casing having a pair of air adinission port openingstherein communicating with said pumping chamber, an intermediatescavenging-air port opening leading to said combustion chamber and anair emission port opening communicating with said oombustion chamber, avalve slidable in said casing and having adjacent chambers therein,means for entrapping air in one of said ports therein adapted toregister, respectively, with the port openings in said valve casing, andmeans for reciprocating said valve to suc cessively cause the portstherein to register with the port openings in said valve casing, wherebyair entering the valve casing through said admission port openings flowsthrough the scavenging-air port opening into the combustion chamber andthereafter the entrapped air flows into said combustion chamber throughsaid air emission port opening.

4. In a two stroke cycle combustion engine, the combination o an enginecylinder havine a combustion chamber and a. pumping chamber therein, av'alve casin supported adjacent said cylinder, a` v ve in said casingdivided 'into adjacent chambers, means for entrapping air in one of saidchambers, there being air passages between said valve casing and saidengine cylinder, and means for reci rocating said valve whereby a chargeo scavenging air first passes into said combustion chamber andthereafter the entrapped air passes into said combustion chamber toadmix with fuel therein.

5. In a two stroke cycle combustion engine, the combination of an enginecylinder having acombustion chamber, a pumping chamber, ,and anintermediate pressuiereducing Ychamber therein, a valve casin supportedadjacent said cylinder, a va ve in said casing divided into ad3accntchambers, there being air passages between said valve casing and saidengine cylinder, and means 4for reciprocating said valve whereby acharge of scavenging air first asses through said pressure-reducing chamer into said c.nnlmstion chamber and thereafter the entrapped air passesinto said combustion chamber to adinix with fuel therein.

In testimony whereof I hereunto aix my signature in thel presence oft'wo witnesses.

CARL RUDQWIS-T.

, Witnesses:

N. Rennen,

VICTOR GUGGENBERGER.

